US8477438B2 - Lens apparatus - Google Patents

Lens apparatus Download PDF

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Publication number
US8477438B2
US8477438B2 US12/944,146 US94414610A US8477438B2 US 8477438 B2 US8477438 B2 US 8477438B2 US 94414610 A US94414610 A US 94414610A US 8477438 B2 US8477438 B2 US 8477438B2
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Prior art keywords
lens
optical
lens barrel
optical accessory
lens apparatus
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US12/944,146
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US20110128638A1 (en
Inventor
Gou Shibasaki
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Canon Inc
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Canon Inc
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Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHIBASAKI, GOU
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/006—Filter holders

Definitions

  • the present invention relates to a lens apparatus capable of attaching an optical accessory on an object side thereof.
  • a lens apparatus of an image pickup apparatus such as a camera or a video camera has an object-side end of a lens barrel protruded beyond a lens on a foremost surface toward an object side in order to protect the lens from damages when the lens apparatus is placed on something.
  • the lens barrel protruded beyond the foremost lens toward the object side is referred to as a lens protection lens barrel.
  • optical accessories to be attached to a front side (object side) of such lens apparatus are commercially available and, for example, an optical filter, a teleconverter, a wide converter, a wide attachment, a fisheye attachment, and a close-up lens are well known (for example, Japanese Patent Application Laid-Open No. 2001-333315).
  • the optical accessories include an optical accessory in which an outer diameter of an optical element in a rearmost portion is larger than that of the lens protection lens barrel.
  • the optical accessory is designed so as to avoid interference between the optical element and the lens apparatus when the optical accessory is attached to the lens apparatus.
  • the attachment of the optical accessory to the lens apparatus is described hereinbelow referring to the attachment of an optical filter to the lens apparatus as an example.
  • the attachment of the optical filter to the lens apparatus is performed via an optical accessory support lens barrel.
  • An outer peripheral portion of the optical filter and an inner peripheral portion of the optical accessory support lens barrel are provided with screw portions, and the optical filter is fixed to the optical accessory support lens barrel by screwing the screw portions together.
  • An inner diameter of an attachment portion of the optical accessory support lens barrel and an outer diameter of an optical accessory attachment portion of the lens apparatus are substantially identical to each other.
  • the optical accessory support lens barrel is firstly inserted from the front side of the lens apparatus.
  • an image pickup apparatus including a retractable lens apparatus as a part thereof in which a switch for detecting attachment of an optical accessory support lens barrel capable of attaching an optical accessory on the front side thereof is provided, and the position of an object-side end of the retractable lens apparatus is limited to a range rearward of a rear end of an optical element of the optical accessory based on the operation of the detection switch (for example, Japanese Patent Application Laid-Open No. 2004-333778).
  • Japanese Patent Application Laid-Open No. 2004-333778 discloses a method of reducing the size of an optical accessory by reducing an interval between the foremost surface of the lens apparatus and the optical accessory with its use limited to a wide-side zoom range shorter than conventional intervals.
  • the lens apparatus is limited to the retractable lens apparatus in which the foremost surface moves back and forth during zooming, and the method is not applicable to optical accessories in general.
  • An object of the present invention is to solve the above-mentioned problem, and to provide a lens apparatus advantageous in achieving reductions in size and weight of an optical accessory in which it has been difficult to reduce an interval between an optical element and a foremost lens of the lens apparatus due to a restriction resulting from interference between the optical element and a lens protection lens barrel.
  • the present invention provides a lens apparatus capable of attaching an optical accessory on an object side thereof, including a lens protection lens barrel, in which; the lens protection lens barrel at an object-side end of the lens apparatus is retracted in an optical axis direction in response to attachment of an optical accessory support lens barrel supporting the optical accessory without changing placement of an optical system of the lens system; and the lens protection lens barrel retracted in the optical axis direction is returned to a position before the attachment of the optical accessory support lens barrel by detaching the optical accessory support lens barrel from the lens apparatus.
  • an optical element of the optical accessory can be moved close to a foremost lens of the lens apparatus without a restriction resulting from interference with the lens protection lens barrel, and hence the lens apparatus advantageous in achieving reductions in size and weight of the optical accessory can be provided.
  • FIG. 1A is a side cross-sectional view of a lens apparatus and an optical accessory according to a first embodiment.
  • FIG. 1B is a side cross-sectional view illustrating a state in which the optical accessory is attached to the lens apparatus in the first embodiment.
  • FIG. 2A is a perspective view illustrating a structure in the vicinity of a locking hole.
  • FIG. 2B is a perspective view of a stopper dowel.
  • FIG. 3A is a side cross-sectional view of a lens apparatus and an optical accessory according to a second embodiment.
  • FIG. 3B is a side cross-sectional view illustrating a state in which the optical accessory is attached to the lens apparatus in the second embodiment.
  • FIG. 4A is a perspective view illustrating a structure in the vicinity of a locking hole.
  • FIG. 4B is a perspective view of a locking member.
  • FIG. 5A is a side cross-sectional view of a lens apparatus and an optical accessory according to a third embodiment.
  • FIG. 5B is a side cross-sectional view illustrating a process of attaching the optical accessory to the lens apparatus.
  • FIG. 5C is a side cross-sectional view illustrating a state in which the optical accessory is attached to the lens apparatus in the third embodiment.
  • FIG. 6 is an exploded perspective view in which principal components of the third embodiment are arranged.
  • FIG. 7A is a partially enlarged view illustrating the vicinity of a projection c of FIG. 6 .
  • FIG. 7B is a partially enlarged view illustrating the vicinity of a click groove of FIG. 6 .
  • FIG. 7C is a partially enlarged view illustrating the vicinity of a hook groove of FIG. 6 .
  • FIG. 8A is a side cross-sectional view of a lens apparatus and an optical accessory according to a fourth embodiment.
  • FIG. 8B is a side cross-sectional view illustrating a state in which the optical accessory is attached to the lens apparatus in the fourth embodiment.
  • FIG. 9A is a side cross-sectional view of a lens apparatus and an optical accessory according to a fifth embodiment.
  • FIG. 9B is a side cross-sectional view illustrating a state in which the optical accessory is attached to the lens apparatus in the fifth embodiment.
  • FIGS. 1A and 1B are side cross-sectional views of principal portions in a first embodiment of a lens apparatus to which the present invention is applied.
  • the lens apparatus is a wide-angle type lens apparatus in which an object-side end of a lens protection lens barrel 31 is protruded forward more than a lens 11 which is the foremost lens of the lens apparatus, and notches are provided in the lens barrel so as to prevent four corners of an image pickup range from being vignetted.
  • An outer diameter of the lens protection lens barrel 31 is fitted in an accessory fixing lens barrel 41 , and is slidable.
  • an inner diameter of the lens protection lens barrel 31 is fitted on a lens support lens barrel 21 , and is slidable.
  • a taper is provided at an object-side end of a portion of the lens protection lens barrel 31 fitted on the lens support lens barrel 21 , and a similar taper is provided at an object-side end of a portion of the lens support lens barrel 21 fitted in the lens protection lens barrel 31 .
  • a keyhole-shaped locking hole 32 and an elongated hole 33 having longitudinal directions parallel with a center axis are provided to pass through a circumferential surface of the lens protection lens barrel 31 .
  • the locking holes 32 are provided at four positions at even intervals in a circumferential direction.
  • a fixing pin 54 that is not shown in FIGS.
  • the lens support lens barrel 21 is provided with a rectangular guiding hole 22 having the same angular phase as that of the locking hole 32 of the lens protection lens barrel 31 .
  • the guiding hole 22 passes through the lens support lens barrel 21 , and one end of the guiding hole 22 is covered with an inner lid ring 23 fixed to the lens support lens barrel 21 with a screw portion.
  • the stopper dowel 51 extends from a hole provided in the accessory fixing lens barrel 41 to an outer peripheral attachment portion.
  • An oblique surface is formed at a tip end portion of the stopper dowel 51 , and the stopper dowel 51 is assembled so that the oblique surface faces the object side.
  • An outer diameter of a middle tier portion of the stopper dowel 51 is set to be substantially equal to a hole diameter of a rearward circular portion of the locking hole 32 , and an outer diameter of an upper tier portion thereof is set to be smaller than a width of an object-side elongated hole portion of the locking hole 32 .
  • the middle tier portion of the stopper dowel 51 is fitted in the rearward circular portion of the locking hole 32 , and hence the lens protection lens barrel 31 is not moved in an optical axis direction even when the lens protection lens barrel 31 is pressed from the object side.
  • the taper of the lens protection lens barrel 31 is in contact with the taper of the lens support lens barrel 21 and is biased by the coil spring 53 , and hence rattling of the lens protection lens barrel 31 in the optical axis direction and the radial direction is prevented.
  • a screw portion is provided in an inner peripheral portion of the optical accessory support lens barrel 61 , and an optical filter 12 is fixed thereto.
  • An inner diameter of an attachment portion of the optical accessory support lens barrel 61 is substantially equal to an outer diameter of an attachment portion of the accessory fixing lens barrel 41 of the lens apparatus, and a flange 62 protruded toward the inner diameter side more than the attachment portion is provided in the optical accessory support lens barrel 61 .
  • an arc-shaped locking member 72 having one end fixed to the optical accessory support lens barrel 61 is disposed, and a locking screw 71 for pressing is provided in the outer radial direction of the locking member 72 .
  • the optical accessory support lens barrel 61 is gradually inserted into the lens apparatus from the object side thereof. After the rear end of the optical accessory support lens barrel 61 comes in contact with the stopper dowel 51 , as the optical accessory support lens barrel 61 is further inserted into the lens apparatus, the stopper dowel 51 is gradually retracted in the direction of the inner diameter of the lens according to the oblique surface at the tip end thereof. When the hole through which the stopper dowel 51 has extended is covered with the optical accessory support lens barrel 61 , the tip end of the stopper dowel 51 is completely retracted from the attachment portion. At this point, the middle tier portion of the stopper dowel 51 comes out of the rear circular portion of the locking hole 32 .
  • the upper tier portion of the stopper dowel 51 is smaller in diameter than the locking hole 32 , so that the lens protection lens barrel 31 becomes movable in the optical axis direction in response to a pressing force from the object side.
  • the flange 62 of the optical accessory support lens barrel 61 comes in contact with a stepped portion of an outer peripheral portion of the lens protection lens barrel 31 , and the lens protection lens barrel 31 is moved rearward integrally with the optical accessory support lens barrel 61 .
  • the optical accessory support lens barrel 61 can be fixed to the lens apparatus by tightening the locking screw 71 when the rear end of the optical accessory support lens barrel 61 comes in contact with a flange portion of an outer periphery of the accessory fixing lens barrel 41 so as to engage the arc-shaped locking member 72 with a groove provided in the outer periphery of the accessory fixing lens barrel 41 .
  • the attachment of the optical filter 12 to the optical accessory support lens barrel 61 may be performed before or after the operation of attaching the optical accessory support lens barrel 61 to the lens apparatus.
  • the detachment of the optical accessory support lens barrel 61 from the lens apparatus is performed by pulling out the optical accessory support lens barrel 61 toward the object side after undoing the locking screw 71 .
  • the lens protection lens barrel 31 freed from pressing by the flange 62 of the optical accessory support lens barrel 61 is moved by the biasing force of the coil spring 53 toward the object side to the position where the taper provided in the lens protection lens barrel 31 comes in contact with the taper provided in the lens support lens barrel 21 .
  • the position of axis of the middle tier portion of the stopper dowel 51 is substantially coincident with the position of axis of the rear circular portion of the locking hole 32 in the optical axis direction, and hence the middle tier portion of the stopper dowel 51 is fitted in the rear circular portion of the locking hole 32 by the biasing force of the spring 52 , and the lens protection lens barrel 31 becomes unmovable in the optical axis direction again.
  • the rotation of the lens protection lens barrel 31 relative to the lens support lens barrel 21 is prevented by the fit between the fixing pin 54 and the elongated hole 33 in this embodiment, so that the middle tier portion of the stopper dowel 51 can be fitted in the rear circular portion of the locking hole 32 with high precision.
  • the lens protection lens barrel 31 can be retracted in the optical axis direction in response to the simple operation of attaching the optical accessory support lens barrel 61 to the lens apparatus without changing the placement of the optical system. Consequently, the optical element of the optical accessory can be moved close to the lens 11 as the foremost lens of the lens apparatus without causing the optical element to interfere with the lens protection lens barrel 31 , so that the lens apparatus becomes advantageous in achieving reductions in size and weight of the optical accessory.
  • the lens protection lens barrel 31 is not moved in the optical axis direction even when pressed from the object side under the state in which the optical accessory support lens barrel 61 is not attached, so that the lens 11 as the foremost lens of the apparatus is not damaged even when the lens apparatus without the optical accessory support lens barrel 61 attached thereto is placed on something with the lens 11 being downward.
  • the lens protection lens barrel 31 is retracted in the optical axis direction in response to the operation of attaching the optical accessory support lens barrel 61 .
  • the retracted lens protection lens barrel 31 is returned to the previous position before the attachment of the optical accessory and fixed in the optical axis direction in response to the operation of detaching the optical accessory support lens barrel 61 , so that the lens 11 is not damaged even when the lens apparatus is placed on something with the lens 11 as the foremost lens of the lens apparatus being downward.
  • the lens apparatus of this embodiment has multiple stopper dowels 51 , so that there is little risk that the stopper dowels 51 are retracted in the direction of the inner diameter by mistake and the lens protection lens barrel 31 is moved accordingly except a case when the optical accessory support lens barrel 61 is attached, and therefore the lens apparatus of this embodiment is safe.
  • FIGS. 3A and 3B are side cross-sectional views of principal portions in a second embodiment of the lens apparatus to which the present invention is applied, and the same reference numerals as those in the first embodiment denote the same members. A part of the configuration different from that in the first embodiment is described hereinbelow.
  • a T-shaped locking hole 36 and an elongated hole 37 having a longitudinal direction parallel with the center axis are provided to pass through a circumferential surface of a lens protection lens barrel 35 .
  • Four locking holes 36 are provided respectively at four positions on the lens protection lens barrel 35 at even intervals in the circumferential direction.
  • a lens support lens barrel 25 is provided with concave stopper run-offs 26 at the same angular positions as that of the locking holes 36 of the lens protection lens barrel 35 , and the stopper members 55 illustrated in FIG. 4B are disposed.
  • the stopper member 55 extends from a hole provided in an accessory fixing lens barrel 42 to an outer peripheral attachment portion, and an oblique surface is formed at a tip end portion of the stopper member 55 .
  • a circumferential width of a projection portion 55 a of the stopper member 55 is set to be smaller than a circumferential width of a hole portion on the object side of the locking hole 36 that is in parallel with the optical axis.
  • a circumferential width of a locking portion 55 b of the stopper member 55 is set to be larger than the circumferential width of the hole portion on the object side of the locking hole 36 that is in parallel with the optical axis, and is set to be smaller than a width of a circumferential hole on the rear of the locking hole 36 .
  • the projection portion 55 a of the stopper member 55 is positioned substantially at a point of intersection of the hole portion parallel with the optical axis and the circumferential hole portion of the locking hole 36 .
  • An interval is provided between the locking portion 55 b of the stopper member 55 and the locking hole 36 , where the interval is at least so large that the locking portion 55 b and the locking hole 36 do not come in contact with each other even when the projection portion 55 a of the stopper member 55 is pressed inwardly in the radial direction and a thin wall portion is elastically deformed.
  • the interval is set to be smaller than the protrusion amount of the object-side end of the lens protection lens barrel 35 from the lens 11 as the foremost lens of the lens apparatus.
  • the optical accessory support lens barrel 61 is gradually inserted into the lens apparatus from the object side thereof. After the rear end of the optical accessory support lens barrel 61 comes in contact with the stopper member 55 , as the optical accessory support lens barrel 61 is further inserted into the lens apparatus to press the oblique surface of the tip end of the stopper member 55 , the stopper member 55 is pressed inwardly in the radial direction of the lens.
  • One end of the stopper member 55 is fixed to the lens support lens barrel 25 , and hence the thin wall portion is elastically deformed when the tip end is pressed inwardly in the radial direction of the lens, and the vicinity of the tip end portion is retracted in the direction of the inner diameter along a substantially arc-like path.
  • the tip end of the stopper member 55 is completely retracted from the attachment portion.
  • the locking portion 55 b of the stopper member 55 is retracted further inwardly of the inner diameter of the lens protection lens barrel 35 , so that the lens protection lens barrel 35 becomes movable in the optical axis direction in response to the pressing force from the object side.
  • the flange 62 of the optical accessory support lens barrel 61 comes in contact with a stepped portion in an outer peripheral portion of the lens protection lens barrel 35 , and the lens protection lens barrel 35 is moved rearward integrally with the optical accessory support lens barrel 61 .
  • the locking screw 71 is tightened, and the optical accessory support lens barrel 61 can be thereby fixed to the lens apparatus.
  • the detachment of the optical accessory support lens barrel 61 from the lens apparatus is performed by pulling out the optical accessory support lens barrel 61 toward the object side after undoing the locking screw 71 .
  • the lens protection lens barrel 35 freed from pressing by the flange 62 of the optical accessory support lens barrel 61 is moved by the biasing force of the coil spring 56 toward the object side to the position where the taper provided in the lens protection lens barrel 35 comes in contact with the taper provided in the lens support lens barrel 25 .
  • the stopper member 55 which has been elastically deformed with its tip end portion retracted in the direction of the inner diameter, is restored back to the shape before the optical accessory support lens barrel 61 is attached to the lens apparatus by its own elastic force.
  • the lens protection lens barrel 35 is retracted in the optical axis direction in response to the simple operation of attaching the optical accessory support lens barrel 61 to the lens apparatus. Consequently, the optical element of the optical accessory can be moved close to the lens 11 as the foremost lens of the lens apparatus without causing the optical element to interfere with the lens protection lens barrel 35 , and the lens apparatus becomes advantageous in achieving reductions in size and weight of the optical accessory.
  • the object-side end of the lens protection lens barrel 35 is not moved rearwardly of the lens 11 as the foremost lens of the lens apparatus even when pressed from the object side, and hence the lens 11 as the foremost lens is not damaged even when the lens apparatus without the optical accessory support lens barrel 61 attached thereto is placed on something with the lens 11 being downward.
  • the lens protection lens barrel 35 is retracted in the optical axis direction in response to the operation of attaching the optical accessory support lens barrel 61 .
  • the retracted lens protection lens barrel 35 is returned to the previous position before the attachment of the optical accessory and fixed in the optical axis direction in response to the operation of detaching the optical accessory support lens barrel 61 , so that the lens 11 is not damaged even when the lens apparatus is placed on something with the lens 11 as the foremost lens of the lens apparatus being downward.
  • the lens apparatus of this embodiment has multiple stopper members 55 , so that there is little risk that the stopper members 55 are retracted in the direction of the inner diameter by mistake and the lens protection lens barrel 35 is moved accordingly except when the optical accessory support lens barrel 61 is attached, and therefore the lens apparatus of this embodiment is safe.
  • FIGS. 5A , 5 B, and 5 C are side cross-sectional views of principal portions in a third embodiment of the lens apparatus to which the present invention is applied, and the same reference numerals as those in the first embodiment denote the same members.
  • FIG. 6 is an exploded perspective view in which an optical accessory support lens barrel 63 , a lens protection lens barrel 81 , and an accessory fixing lens barrel 43 according to this embodiment are schematically arranged.
  • the lens apparatus is a wide-angle type lens apparatus in which an object-side end of the lens protection lens barrel 81 is protruded forward of the lens 11 as the foremost lens of the apparatus, and notches are provided in the lens barrel so as to prevent four corners of the image pickup range from being vignetted.
  • An inner diameter of the lens protection lens barrel 81 is fitted on a lens support lens barrel 28 , and is slidable.
  • An outer peripheral portion of the lens protection lens barrel 81 is formed with a projection b 82 and an arc-shaped flange portion 83 .
  • a part of a rear end of the flange portion 83 is formed with a projection c 84 , as illustrated in FIG. 7A .
  • a hole 85 is provided on the object side of the projection c 84 , and the vicinity of the projection c 84 of the lens protection lens barrel 81 is elastically deformable.
  • Each of the above-mentioned projection b 82 , flange portion 83 , projection c 84 , and hole 85 is provided at four positions at even intervals in a circumferential direction.
  • the lens protection lens barrel 81 is slidably attached to the accessory fixing lens barrel 43 .
  • a flange run-off 44 is provided and the flange portion 83 of the lens protection lens barrel 81 is allowed to slide in the optical axis direction by the flange run-off 44 , and an engagement groove 45 is provided and the flange portion 83 is allowed to slide in the circumferential direction by the engagement groove 45 .
  • the flange run-off 44 is partially coupled to the engagement groove 45 .
  • a click groove 46 is provided in a part of the engagement groove 45 , as illustrated in FIG. 7B .
  • Each of the above-mentioned flange run-off 44 , engagement groove 45 , and click groove 46 is provided at four positions at even intervals in the circumferential direction.
  • the flange portion 83 of the lens protection lens barrel 81 is engaged with the engagement groove 45 of the accessory fixing lens barrel 43 , and the projection c 84 is in contact with a side surface of the click groove 46 .
  • the vicinity of the projection c 84 of the lens protection lens barrel 81 is elastically deformed, and the lens protection lens barrel 81 is biased toward the object side by its own elastic force.
  • a taper is provided on the object side of each of the flange portion 83 and the engagement groove 45 , so that rattling of the lens protection lens barrel 81 in the shooting state without using the attached optical accessory in the optical axis direction and the radial direction is prevented.
  • the flange portion 83 is engaged with the engagement groove 45 , so that the lens protection lens barrel 81 is not moved in the optical axis direction even when pressed from the object side.
  • the lens protection lens barrel 81 When the lens protection lens barrel 81 is rotated relative to the accessory fixing lens barrel 43 clockwise when viewed from the object side with a biasing force of specific torque or more, the vicinity of the projection c 84 of the lens protection lens barrel 81 is further elastically deformed, and the projection c 84 can move out of the click groove 46 .
  • the lens protection lens barrel 81 is further rotated until phases of the flange portion 83 and the flange run-off 44 match each other, and thus the lens protection lens barrel 81 becomes movable in the optical axis direction.
  • the lens protection lens barrel 81 With the engagement of the flange portion 83 as a part of the lens protection lens barrel 81 with the flange run-off 44 and the engagement groove 45 (locking member) that are formed on the inner peripheral side of the accessory fixing lens barrel 43 , the lens protection lens barrel 81 becomes slidable relative to the accessory fixing lens barrel 43 in the optical axis direction only at a specific phase in the circumferential direction. Moreover, only when the lens protection lens barrel 81 is at a specific position in the optical axis direction relative to the accessory fixing lens barrel 43 , the lens protection lens barrel 81 becomes slidable relative to the accessory fixing lens barrel 43 in the circumferential direction within the range of the specific phase in the circumferential direction.
  • the configuration of the optical accessory support lens barrel 63 is different from that of the first embodiment only in a shape of an attachment portion.
  • a projection a 64 and an L-shaped hook groove 65 illustrated in FIG. 7C are provided on an inner diameter side of the attachment portion of the optical accessory support lens barrel 63 .
  • Dimensions of the projection a 64 are set so that the projection a 64 can be accommodated in a crank-shaped guiding groove 47 provided in an outer periphery of the accessory fixing lens barrel 43 .
  • dimensions of the hook groove 65 are set so that the projection b 82 of the lens protection lens barrel 81 can be accommodated therein.
  • Each of the above-mentioned projection a 64 , hook groove 65 , and guiding groove 47 is provided at four positions at even intervals in the circumferential direction.
  • the optical accessory support lens barrel 63 is gradually inserted into the lens apparatus from the object side thereof with the projection a 64 fitted in the guiding groove 47 .
  • the projection b 82 is accommodated in the hook groove 65 .
  • the lens protection lens barrel 81 having the projection b 82 hooked in the hook groove 65 starts to be rotated integrally with the optical accessory support lens barrel 63 .
  • the projection c 84 cannot move out of the click groove 46 , so that the optical accessory support lens barrel 63 and the lens protection lens barrel 81 cannot be rotated.
  • the flange portion 83 is set to reach the same phase as that of the flange run-off 44 . From this state, when the optical accessory support lens barrel 63 is further inserted rearward with the projection a 64 fitted in the guiding groove 47 , as illustrated in FIG. 5C , the lens protection lens barrel 81 is moved rearward integrally with the optical accessory support lens barrel 63 .
  • the locking screw 71 is tightened, and the optical accessory support lens barrel 63 can be thereby fixed to the lens apparatus.
  • the optical accessory support lens barrel 63 After undoing the locking screw 71 , with the projection a 64 fitted in the guiding groove 47 , the optical accessory support lens barrel 63 is firstly pulled out toward the object side. At this point, the lens protection lens barrel 81 having the projection b 82 hooked in the hook groove 65 is moved toward the object side integrally with the optical accessory support lens barrel 63 .
  • the projection a 64 reaches the end of the circumferential groove portion of the guiding groove 47 , and the hooking of the projection b 82 in the hook groove 65 is released.
  • the optical accessory support lens barrel 63 is pulled out toward the object side with the projection a 64 fitted in the guiding groove 47 , and the optical accessory support lens barrel 63 can be thereby detached from the lens apparatus.
  • the lens protection lens barrel 81 is retracted in the optical axis direction in response to the simple operation of attaching the optical accessory support lens barrel 63 to the lens apparatus. Consequently, the optical element of the optical accessory can be moved close to the lens 11 as the foremost lens of the lens apparatus without causing the optical element to interfere with the lens protection lens barrel 81 , and hence the lens apparatus becomes advantageous in achieving reductions in size and weight of the optical accessory.
  • the lens protection lens barrel 81 is not moved in the optical axis direction even when pressed from the object side, and hence the lens 11 as the foremost lens of the lens apparatus is not damaged even when the lens apparatus without the optical accessory support lens barrel 63 attached thereto is placed on something with the lens 11 being downward.
  • the lens protection lens barrel 81 is retracted in the optical axis direction in response to the operation of attaching the optical accessory support lens barrel 63 .
  • the retracted lens protection lens barrel 81 is returned to the previous position before the attachment of the optical accessory and fixed in the optical axis direction in response to the operation of detaching the optical accessory support lens barrel 63 , so that the lens 11 is not damaged even when the lens apparatus is placed on something with the lens 11 as the foremost lens of the lens apparatus being downward.
  • the optical accessory is fixed to the optical accessory support lens barrel.
  • the optical accessory support lens barrel may have a function other than the function of supporting the optical accessory.
  • the present invention is also applicable to, for example, the case where a hood fixing lens barrel 66 provided with an optical accessory support part is attached to the lens apparatus, as illustrated in FIGS. 8A and 8B .
  • the lens apparatus illustrated in the drawings is the wide-angle type lens apparatus.
  • the optical accessory illustrated in the drawings is the optical filter.
  • the scope of the present invention is not limited thereto.
  • the present invention is also applicable to, for example, the case where an optical accessory 13 other than the optical filter is attached to an optical system lens apparatus other than the wide-angle type lens apparatus, as illustrated in FIGS. 9A and 9B .
  • the configuration of an optical accessory support lens barrel 67 , a lens support lens barrel 29 , a lens protection lens barrel 86 , and an accessory fixing lens barrel 48 , and an operation method are substantially identical to those in the third embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lens Barrels (AREA)
  • Blocking Light For Cameras (AREA)
  • Structure And Mechanism Of Cameras (AREA)
US12/944,146 2009-12-02 2010-11-11 Lens apparatus Expired - Fee Related US8477438B2 (en)

Applications Claiming Priority (2)

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JP2009-274628 2009-12-02
JP2009274628A JP5455586B2 (ja) 2009-12-02 2009-12-02 レンズ装置

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US20110128638A1 US20110128638A1 (en) 2011-06-02
US8477438B2 true US8477438B2 (en) 2013-07-02

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CN109411766B (zh) * 2018-06-27 2024-08-09 江苏壹度科技股份有限公司 一种光学显微镜镜头
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